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Now Print perovskite Solar Cells easily and at the cost similar to bringing out a Newspaper!

Researchers of University of Toronto Engineering have found that the solar cells manufactured with perovskite mineral could lead to low-cost solar panels

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Solar panels absorbing sunlight. Pixabay
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Toronto, Feb 18, 2017: Researchers have found a novel way to print perovskite solar cells easily and at a cost similar to bringing out a newspaper!

A team, led by Hairen Tan from University of Toronto Engineering found that the solar cells manufactured with perovskite mineral could lead to low-cost, printable solar panels capable of turning nearly any surface into a power generator.

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“Economies of scale have greatly reduced the cost of silicon manufacturing,” Ted Sargent, an expert in emerging solar technologies, said in a university statement.

“Potentially, perovskites and silicon cells can be married to improve efficiency further, but only with advances in low-temperature processes,” added Sargent, who is also the Canada Research Chair in Nanotechnology.

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Perovskite solar cells depend on a layer of tiny crystals — each about 1,000 times smaller than the width of a human hair — made of low-cost, light-sensitive materials.

Because the perovskite raw materials can be mixed into a liquid to form a kind of ‘solar ink’, they could be printed onto glass, plastic or other materials using a simple inkjet printing process.

“The most effective materials for making electron selective layers (ESLs) start as a powder and have to be baked at high temperatures, above 500 degrees Celsius,” said Tan.

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Tan noted that perovskite solar cells using the older, high-temperature method are only marginally better at 22.1 per cent and even the best silicon solar cells can only reach 26.3 per cent.

Tan’s perovskite solar cells were also stable and retained more than 90 per cent of their efficiency even after 500 hours of use. (IANS)

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USA: Everything you want to know about Security Clearance; Find out here!

A security clearance allows a person access to classified national security information or restricted areas.

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Former CIA Director John O. Brennan speaks at the Council on Foreign Relations in Washington, March 11, 2014. President Donald Trump revoked Brennan's security clearance Wednesday. VOA
Former CIA Director John O. Brennan speaks at the Council on Foreign Relations in Washington, March 11, 2014. President Donald Trump revoked Brennan's security clearance Wednesday. VOA

U.S. President Donald Trump on Wednesday revoked the security clearance of former CIA Director John Brennan. We take a look at what that means.

What is a security clearance?

A security clearance allows a person access to classified national security information or restricted areas after completion of a background check. The clearance by itself does not guarantee unlimited access. The agency seeking the clearance must determine what specific area of information the person needs to access.

What are the different levels of security clearance?

There are three levels: Confidential, secret and top secret. Security clearances don’t expire. But, top secret clearances are reinvestigated every five years, secret clearances every 10 years and confidential clearances every 15 years.

All federal agencies follow a list of 13 potential justifications for revoking or denying a clearance. VOA
All federal agencies follow a list of 13 potential justifications for revoking or denying a clearance. VOA

Who has security clearances?

According to a Government Accountability Office report released last year, about 4.2 million people had a security clearance as of 2015, they included military personnel, civil servants, and government contractors.

Why does one need a security clearance in retirement?

Retired senior intelligence officials and military officers need their security clearances in case they are called to consult on sensitive issues.

Also Read: Governments Across The World Request Apple for 30,000 Device Information

Can the president revoke a security clearance?

Apparently. But there is no precedent for a president revoking someone’s security clearance. A security clearance is usually revoked by the agency that sought it for an employee or contractor. All federal agencies follow a list of 13 potential justifications for revoking or denying a clearance, which can include criminal acts, lack of allegiance to the United States, behavior or situation that could compromise an individual and security violations. (VOA)